The zero algebraic object

Test for a freealg object's being zero

is.zero(x)

Arguments

x

Object of class freealg

Details

Function is.zero() returns TRUE if x is indeed the zero free algebra object. It is defined as length(coeffs(x)) == 0 for reasons of efficiency, but conceptually it returns x == constant(0).

(Use constant(0) to create the zero object).

Author

Robin K. S. Hankin

See also

constant

Examples

stopifnot(is.zero(constant(0)))